This is what you were wondering @jack_milroyhttps://twitter.com/PWGTennant/status/1258506049067216897 …
Pleasure! There's a great paper on it here with worked examples https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6103824/pdf/nihms963846.pdf …
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The other issue is survivorship bias - if you exclude the impact of negative health conditions, people who smoke tend to be younger and thus less likely to die from COVID-19. Thus, smoking may be a proxy for something else once you've removed all of the things that it causes
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There is no way I could have explained that as eloquently as Gid did. This is why I’m a policy person and he’s in epi
End of conversation
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